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arXiv · 1603.03300

Modeling dynamical scalarization with a resummed post-Newtonian expansion

Noah Sennett·Alessandra Buonanno
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Abstract

Despite stringent constraints set by astrophysical observations, there remain viable scalar-tensor theories that could be distinguished from general relativity with gravitational-wave detectors. A promising signal predicted in these alternative theories is dynamical scalarization, which can dramatically affect the evolution of neutron-star binaries near merger. Motivated by the successful treatment of spontaneous scalarization, we develop a formalism that partially resums the post-Newtonian expansion to capture dynamical scalarization in a mathematically consistent manner. We calculate the post-Newtonian order corrections to the equations of motion and scalar mass of a binary system. Through comparison with quasi-equilibrium configuration calculations, we verify that this new approximation scheme can accurately predict the onset and magnitude of dynamical scalarization.

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Noah Sennett, Alessandra Buonanno. 2016-03-10. Modeling dynamical scalarization with a resummed post-Newtonian expansion. https://doi.org/10.1103/physrevd.93.124004

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